From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Nathan Chancellor <natechancellor@gmail.com>,
Nick Desaulniers <ndesaulniers@google.com>,
Steven Rostedt <rostedt@goodmis.org>,
Sasha Levin <sashal@kernel.org>
Subject: [PATCH AUTOSEL 4.4 35/64] tracing: Use address-of operator on section symbols
Date: Thu, 17 Sep 2020 22:16:14 -0400 [thread overview]
Message-ID: <20200918021643.2067895-35-sashal@kernel.org> (raw)
In-Reply-To: <20200918021643.2067895-1-sashal@kernel.org>
From: Nathan Chancellor <natechancellor@gmail.com>
[ Upstream commit bf2cbe044da275021b2de5917240411a19e5c50d ]
Clang warns:
../kernel/trace/trace.c:9335:33: warning: array comparison always
evaluates to true [-Wtautological-compare]
if (__stop___trace_bprintk_fmt != __start___trace_bprintk_fmt)
^
1 warning generated.
These are not true arrays, they are linker defined symbols, which are
just addresses. Using the address of operator silences the warning and
does not change the runtime result of the check (tested with some print
statements compiled in with clang + ld.lld and gcc + ld.bfd in QEMU).
Link: http://lkml.kernel.org/r/20200220051011.26113-1-natechancellor@gmail.com
Link: https://github.com/ClangBuiltLinux/linux/issues/893
Suggested-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
kernel/trace/trace.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 17ea5f9d36b48..e4a0c0308b507 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -7263,7 +7263,7 @@ __init static int tracer_alloc_buffers(void)
goto out_free_buffer_mask;
/* Only allocate trace_printk buffers if a trace_printk exists */
- if (__stop___trace_bprintk_fmt != __start___trace_bprintk_fmt)
+ if (&__stop___trace_bprintk_fmt != &__start___trace_bprintk_fmt)
/* Must be called before global_trace.buffer is allocated */
trace_printk_init_buffers();
--
2.25.1
next prev parent reply other threads:[~2020-09-18 2:21 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-18 2:15 [PATCH AUTOSEL 4.4 01/64] scsi: aacraid: fix illegal IO beyond last LBA Sasha Levin
2020-09-18 2:15 ` [PATCH AUTOSEL 4.4 02/64] m68k: q40: Fix info-leak in rtc_ioctl Sasha Levin
2020-09-18 2:15 ` [PATCH AUTOSEL 4.4 03/64] gma/gma500: fix a memory disclosure bug due to uninitialized bytes Sasha Levin
2020-09-18 2:15 ` [PATCH AUTOSEL 4.4 04/64] ASoC: kirkwood: fix IRQ error handling Sasha Levin
2020-09-18 2:15 ` [PATCH AUTOSEL 4.4 05/64] ata: sata_mv, avoid trigerrable BUG_ON Sasha Levin
2020-09-18 2:15 ` [PATCH AUTOSEL 4.4 06/64] PM / devfreq: tegra30: Fix integer overflow on CPU's freq max out Sasha Levin
2020-09-18 2:15 ` [PATCH AUTOSEL 4.4 07/64] mtd: cfi_cmdset_0002: don't free cfi->cfiq in error path of cfi_amdstd_setup() Sasha Levin
2020-09-18 2:15 ` [PATCH AUTOSEL 4.4 08/64] mfd: mfd-core: Protect against NULL call-back function pointer Sasha Levin
2020-09-18 2:15 ` [PATCH AUTOSEL 4.4 09/64] tracing: Adding NULL checks for trace_array descriptor pointer Sasha Levin
2020-09-18 2:15 ` [PATCH AUTOSEL 4.4 10/64] bcache: fix a lost wake-up problem caused by mca_cannibalize_lock Sasha Levin
2020-09-18 2:15 ` [PATCH AUTOSEL 4.4 11/64] xfs: fix attr leaf header freemap.size underflow Sasha Levin
2020-09-18 2:15 ` [PATCH AUTOSEL 4.4 12/64] kernel/sys.c: avoid copying possible padding bytes in copy_to_user Sasha Levin
2020-09-18 2:15 ` [PATCH AUTOSEL 4.4 13/64] neigh_stat_seq_next() should increase position index Sasha Levin
2020-09-18 2:15 ` [PATCH AUTOSEL 4.4 14/64] rt_cpu_seq_next " Sasha Levin
2020-09-18 2:15 ` [PATCH AUTOSEL 4.4 15/64] seqlock: Require WRITE_ONCE surrounding raw_seqcount_barrier Sasha Levin
2020-09-18 2:15 ` [PATCH AUTOSEL 4.4 16/64] ACPI: EC: Reference count query handlers under lock Sasha Levin
2020-09-18 2:15 ` [PATCH AUTOSEL 4.4 17/64] tracing: Set kernel_stack's caller size properly Sasha Levin
2020-09-18 2:15 ` [PATCH AUTOSEL 4.4 18/64] ext4: make dioread_nolock the default Sasha Levin
2020-09-18 2:15 ` [PATCH AUTOSEL 4.4 19/64] ar5523: Add USB ID of SMCWUSBT-G2 wireless adapter Sasha Levin
2020-09-18 2:15 ` [PATCH AUTOSEL 4.4 20/64] Bluetooth: Fix refcount use-after-free issue Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 21/64] mm: pagewalk: fix termination condition in walk_pte_range() Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 22/64] Bluetooth: prefetch channel before killing sock Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 23/64] skbuff: fix a data race in skb_queue_len() Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 24/64] audit: CONFIG_CHANGE don't log internal bookkeeping as an event Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 25/64] selinux: sel_avc_get_stat_idx should increase position index Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 26/64] scsi: lpfc: Fix RQ buffer leakage when no IOCBs available Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 27/64] drm/omap: fix possible object reference leak Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 28/64] dmaengine: tegra-apb: Prevent race conditions on channel's freeing Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 29/64] media: go7007: Fix URB type for interrupt handling Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 30/64] Bluetooth: guard against controllers sending zero'd events Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 31/64] drm/amdgpu: increase atombios cmd timeout Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 32/64] Bluetooth: L2CAP: handle l2cap config request during open state Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 33/64] media: tda10071: fix unsigned sign extension overflow Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 34/64] tpm: ibmvtpm: Wait for buffer to be set before proceeding Sasha Levin
2020-09-18 2:16 ` Sasha Levin [this message]
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 36/64] serial: 8250_omap: Fix sleeping function called from invalid context during probe Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 37/64] SUNRPC: Fix a potential buffer overflow in 'svc_print_xprts()' Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 38/64] ubifs: Fix out-of-bounds memory access caused by abnormal value of node_len Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 39/64] ALSA: usb-audio: Fix case when USB MIDI interface has more than one extra endpoint descriptor Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 40/64] mm/filemap.c: clear page error before actual read Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 41/64] mm/mmap.c: initialize align_offset explicitly for vm_unmapped_area Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 42/64] serial: uartps: Wait for tx_empty in console setup Sasha Levin
2020-09-28 20:16 ` Naresh Kamboju
2020-09-28 22:00 ` Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 43/64] KVM: Remove CREATE_IRQCHIP/SET_PIT2 race Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 44/64] bdev: Reduce time holding bd_mutex in sync in blkdev_close() Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 45/64] drivers: char: tlclk.c: Avoid data race between init and interrupt handler Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 46/64] dt-bindings: sound: wm8994: Correct required supplies based on actual implementaion Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 47/64] atm: fix a memory leak of vcc->user_back Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 48/64] phy: samsung: s5pv210-usb2: Add delay after reset Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 49/64] Bluetooth: Handle Inquiry Cancel error after Inquiry Complete Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 50/64] USB: EHCI: ehci-mv: fix error handling in mv_ehci_probe() Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 51/64] tty: serial: samsung: Correct clock selection logic Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 52/64] ALSA: hda: Fix potential race in unsol event handler Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 53/64] fuse: don't check refcount after stealing page Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 54/64] USB: EHCI: ehci-mv: fix less than zero comparison of an unsigned int Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 55/64] e1000: Do not perform reset in reset_task if we are already down Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 56/64] printk: handle blank console arguments passed in Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 57/64] vfio/pci: fix memory leaks of eventfd ctx Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 58/64] perf kcore_copy: Fix module map when there are no modules loaded Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 59/64] mtd: rawnand: omap_elm: Fix runtime PM imbalance on error Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 60/64] ceph: fix potential race in ceph_check_caps Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 61/64] mtd: parser: cmdline: Support MTD names containing one or more colons Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 62/64] x86/speculation/mds: Mark mds_user_clear_cpu_buffers() __always_inline Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 63/64] vfio/pci: Clear error and request eventfd ctx after releasing Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 64/64] vfio/pci: fix racy on error and request eventfd ctx Sasha Levin
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